Unlike life cycles, do not have to move through each stage. An igneous rock can be changed into a metamorphic rock, a metamorphic rock can crumble to become a sedimentary rock, and a sedimentary rock can be remelted to become magma.

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus. b) the number of neutrons it contains in its nucleus. c) the number of protons it has in a cloud around the nucleus. d) the number of neutrons it has in a cloud around the nucleus. e) the number of electrons it exchanges with its neighbors.